Life Sciences
Data on life sciences reported by researchers at Washington University
Published in Health and Medicine Week, November 6th, 2006
Research findings, "Ramsay-curve item response theory (RC-IRT) to detect and correct for nonnormal latent variables," are discussed in a new report. "Popular methods for fitting unidimensional item response theory (IRT) models to data assume that the latent variable is normally distributed in the population of respondents, but this can be unreasonable for some variables. Ramsay-curve IRT (RC-IRT) was developed to detect and correct for this nonnormality," scientists writing in the journal Psychological Methods report.
"The primary aims of this article are to introduce RC-IRT less technically than it has been described elsewhere; to evaluate RC-IRT for ordinal...
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